package cn.hdu.liang.typeinfo;

import cn.hdu.liang.typeinfo.interfacea.A;

class B implements A {

    @Override
    public void f() {

    }

    public void g() {

    }
}

public class InterfaceViolation {
    public static void main(String[] args) {
        A a = new B();
        a.f();
        System.out.println(a.getClass().getName());
        if(a instanceof B) {
            B b = (B) a;
            b.g();
        }
    }
}
